Compatibilidad y tiempo de sobrevivencia de tres bacterias benéficas de uso agrícola (Bacillus thurigiensis, Bacillus subtilis, Bacillus laterosporus), en bioles

Abstract

At present, the contamination and loss of macro and micro fauna and flora due to the excessive use of pesticides, allows the attack of pests and diseases in crops to be more aggressive and difficult to control. The soil feeds living beings in which millions of microorganisms coexist, forming a total balance of survival. Microorganisms allow plant nutrition, control pests and diseases in crops. In this scientific proposal, the compatibility and survival time of three bacteria of the Bacillus genus, for agricultural use, were evaluated for the improvement of bioles. In each treatment the number of CFU (colony forming units) was evaluated at 30, 60 and 90 days after inoculation in a biol substrate, the treatments were compared with a control where the bacteria were not inoculated. According to the results, the lowest population values were observed 1 month after inoculation of the biol with the different species of Bacillus, in which no effect of the species of bacteria or the applied dose was observed, observing that the number of CFU varied from 188.4 in B. subtilis up to 1186.1 in B. thuringiensis. The evaluations at the second month showed that there was an interaction effect between the bacteria and the dose used, noting that the greatest increase in the number of CFU occurred when B. laterousporus was used at 150 mL / 20L of biol in which it reached 2824.0 CFU (table 8). On the other hand, the following combinations resulted in the lowest populations were B. laterosusporus at 50 mL, B. thuringiensis at the 100 mL dose and B. subtilis at 100 and 150 mL doses. The rest of the treatments showed intermediate values that ranged between 1114.6 and 2215.3 CFU when B. thuringiensis was used at doses of 50 and 150 mL, respectively.